Tool holding chuck



Nov. 17, 1931. B. R. SHEETS 1,832,141

rrrrrr w 'Patented Nov. 17, 1931 unirse STATES PATENT eprice BARTON R. SHEETS, OF DENVER, COLORADO, ASSIGNOR TO GARDNER-DENVERV COMPANY, DENVER, COLORADO, .A CORPORATION OF DELAMTARE Toor. HOLDING CHUCK Application iled May 21,

In the construction of chucks for rock drills anol similar tools in which the chucl is rotatable,'the chuck driver or sleeve is ordinarily made of steel, and the nut that is engaged with the hammer piston and is carried by the sleeve, is of bronze. Heretofore the face of the shoulder inthe sleeve against which the nut is abutted, has been in a plane perpendicular to the longitudinal axis of th sleeve. Experience has shown that there is a tendency of the nut to be moved against-` this shoulder, and as a result the material of the nut at its abutting end is caused to be pressed out against the reciprocating face of the piston hammer. This has a tendency to scar and retard the free movement of the hammer.

The object of the present invention is to provide a structure that will overcome this difficulty.

The preferred embodiment is illustrated in the accompanying drawings, wherein:

Figure l is a longitudinal sectional view through the chuck end of a rock drill. y

Figure 2 is a cross sectional view on the line 2 2 of Figure l.

Figure 3 is a detail view on an enlarged scale of the abutment shoulder and the end' of the nut engaging the same. f-

Tlie structure in its general make-up may be of the usual character. It includes a chuck housing al., within which is a rotatable chuck driver in the form of a sleeve 5. Interloclred Tvith the front end of the sleeve is the chuck 6 that receives the shank 7 of a drill steel or other tool. A tappet 8 is mounted in the chuck driver and kis abuttedY against by the steel. rIhis tappet is hammered upon by the extension 9 of a reciprocatory hammer pisi l ton 10. Y

yFormed within the rear portionrof the chuck driver or sleeve is a rearwardly faced shoulder 11 that is inclined rearwardly andV inwardlyso that it is out of a'plane` perpendicular to the longitudinal axis ofthe sleeve 5. The nut l2 withy which the hammer extension 9 slidably interfits is threaded .into the rear end of the sleeve and its inner end is beveled-that is to say, its end face 13 is inclined inwardly and rearwardly to cor- 1928. Serial No. 279,375.

respond to the inclination of the face 11 of the shoulder, the sleeve 5 being of steel and the nut 12 of softer material, such as bronze and the like. It has been found that With this formation, there is not the tendency of the metal, forming the inner end of the nut l2, to be crowded inwardly; so as to scratch and mar the extension 9 of the hammer extension and retard its free movement.

From the foregoing, it is thought that the construction, operation and many advantages of the herein' described invention Will ybe apparent to those skilled in the art without further description and it will be understood that various changes in the size, shape, pro` portion and minor details of construction may be resorted' to Without departing from in rear of the shoulder, a nut threadedL into n the sleeve and having its'front end inclined correspondingly to and abutting the said shoulder, said nut being ofsofter material than the sleeve, and a hammer piston having a slidably interlocked interfitting engagement with the nut. v

In testimony whereof, I affix my signature. Y

yBAR-TON R. SHEETS.` 

